For service and parts needs, visit your dealer. You will receive genuine GM parts and GM-trained and supported service people.
Genuine GM parts have one of these marks:

Vehicle Care
California Proposition 65 WarningConnections
OnStar Hands-Free Calling allows calls to be made and received from the vehicle.
The vehicle can also be controlled from a cell phone through the OnStar RemoteLink
mobile app.
For coverage maps, see www.onstar.com (U.S.), www.onstar.ca (Canada).
Hands-Free Calling
1. Press . System responds: ...
Driver or Passenger Seat Back Cushion Cover and Pad Replacement
Removal Procedure
Warning: Refer to SIR Warning in the Preface section.
Warning: Replace the passenger presence system as a complete assembly to prevent
possible injury to the occupant. The bladder, the
pressure sensor, the seat cushion, and the control module are assembled and
calibrated a ...
Hood Replacement
Warning: When a hood hold open device is being removed or installed,
provide alternate support to avoid the possibility of
damage to the vehicle or personal injury.
Preliminary Procedure
Remove the windshield washer nozzle hose. Refer to Windshield Washer Nozzle
Hose Replacement.
Hood ...